foo.c: In function 'main':
foo.c:4:2: error: 'inta' undeclared (first use in this function); did you mean 'int'?
    4 | {inta,b,c,d
      |  ^~~~
      |  int
foo.c:4:2: note: each undeclared identifier is reported only once for each function it appears in
foo.c:4:7: error: 'b' undeclared (first use in this function)
    4 | {inta,b,c,d
      |       ^
foo.c:4:6: warning: left-hand operand of comma expression has no effect [-Wunused-value]
    4 | {inta,b,c,d
      |      ^
foo.c:4:9: error: 'c' undeclared (first use in this function)
    4 | {inta,b,c,d
      |         ^
foo.c:4:8: warning: left-hand operand of comma expression has no effect [-Wunused-value]
    4 | {inta,b,c,d
      |        ^
foo.c:4:11: error: 'd' undeclared (first use in this function)
    4 | {inta,b,c,d
      |           ^
foo.c:4:10: warning: left-hand operand of comma expression has no effect [-Wunused-value]
    4 | {inta,b,c,d
      |          ^
foo.c:4:12: error: expected ';' before 'd'
    4 | {inta,b,c,d
      |            ^
      |            ;
    5 |  d=(a%c）*（b%c）;
      |  ~          
foo.c:13:1: error: expected declaration or statement at end of input
   13 | }
      | ^

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